I would have compressed it with some kind of Reed-Solomon (ARC, RAR,...) and sent this hexdump instead per fax. Much shorter (audio is extremely compressable) a

I would have compressed it with some kind of Reed-Solomon (ARC, RAR,...) and sent this hexdump instead per fax. Much shorter (audio is extremely compressable) and with additional OCR hints in the RS decoder. Even a trivial CRC check per block or line would be better than nothing